YouTube is the world's second most-visited website.
On the YouTube mobile app, users saw the "Error loading / Tap to retry" error message when they attempted to play videos.
YouTube said it was trying to resolve the issue.
Say goodbye to all your favourite let's players, game walkthroughs and new game trailers, YouTube is down!
YouTube is aware of the issue, though no ETA has been given on when we can expect a fix. More information will be provided as it becomes available.
Sterling shines as England defeat Spain
Gain in Spain: Raheem Sterling finishes off Harry Kane's cross past David De Gea during England's victory in Seville last night. Speaking after the game, Ramos described England as "world class" but lamented Spain's abject first half performance.
"Still down in Raleigh, the site loads but nothing is displayed".
These appear with a line of code and a purple monkey holding a hammer, with the message: "Sorry something went wrong", a message from YouTube reads.
When users tried to access YouTube videos - including on RNZ.co.nz - they encountered error messages.